Handheld device with fast-charging capability

Abstract

A handheld device with a fast-charging capability is adapted to be connected to a charger to obtain an electric power. The handheld device includes a battery, a charging circuit, a safety circuit, a control unit, and an input module. The charging circuit is electrically connected to the charger and transfers an electric power to the battery. The safety circuit is used for restricting an upper limit of the electric power transferred by the charging circuit. The input module is provided for a user to input an emergency charge command. Upon receiving the emergency charge command, the control unit instructs the safety circuit to lower the restriction on the charging circuit, so as to raise the upper limit of the electric power that can be obtained by the charging circuit, thereby accelerating the charging of the battery.

1. A handheld device with a fast-charging capability, connected to a charger to obtain an electric power, comprising:
 a battery; 
 a charging circuit, electrically connected to the charger and outputting a charge signal when obtaining the electric power; 
 a safety circuit, connected to the charging circuit, for restricting an upper limit of a current transferred by the charging circuit, wherein the safety circuit comprises an adjusting unit for storing a plurality of setting values, wherein the safety circuit further comprises a current-limit sensing circuit, and when the safety circuit releases the restriction on the charging circuit, the current-limit sensing circuit detects a limit of an electric power carried by the charging circuit so as to enable the safety circuit to adjust the upper limit of the electric power transferred by the charging circuit; 
 an input module, for a user to input an emergency charge command; and 
 a control unit, connected to the charging circuit and the safety circuit, for instructing the charging circuit to transfer a current to the battery when obtaining the charge signal, and instructing the adjusting unit to adjust a restriction on the charging circuit through using a setting value corresponding an adjusting information contained in the emergency charge command according to the adjusting information when obtaining the emergency charge command. 
 
     
     
       2. The handheld device with a fast-charging capability according to  claim 1 , further comprising a detection circuit, for detecting an electric quantity of the battery, and outputting a limit signal to the control unit when the electric quantity of the battery reaching an upper limit is detected, such that the control unit stops the charging circuit from transferring the electric power to the battery. 
     
     
       3. The handheld device with a fast-charging capability according to  claim 1 , wherein the safety circuit further comprises a battery sensing circuit, and when the safety circuit releases the restriction on the charging circuit, the battery sensing circuit detects a limit of an electric power carried by the battery, so as enable the safety circuit to adjust the upper limit of the electric power transferred by the charging circuit. 
     
     
       4. The handheld device with a fast-charging capability according to  claim 1 , further comprising a detection circuit for detecting an electric quantity of the battery, and the charging circuit calculating an electric quantity of the transferred electric power, so as to enable the control unit to calculate a charging complete time of the battery according to the electric quantity of the electric power transferred by the charging circuit and the electric quantity of the battery. 
     
     
       5. The handheld device with a fast-charging capability according to  claim 4 , further comprising a display unit, wherein the control unit outputs the charging complete time of the battery to be displayed on the display unit. 
     
     
       6. The handheld device with a fast-charging capability according to  claim 1 , wherein when instructing the safety circuit to lower the restriction on the charging circuit, the control unit outputs an emergency charge signal. 
     
     
       7. The handheld device with a fast-charging capability according to  claim 6 , further comprising a display unit, wherein the emergency charge signal output by the control unit is a text signal and is displayed on the display unit. 
     
     
       8. The handheld device with a fast-charging capability according to  claim 6 , further comprising a loudspeaker, wherein the emergency charge signal output by the control unit is an audio signal and is broadcasted via the loudspeaker. 
     
     
       9. The handheld device with a fast-charging capability according to  claim 6 , further comprising a display unit, wherein the emergency charge signal output by the control unit is an image signal and is displayed on the display unit.